CMH Brake Piston Spreader

Make brake maintenance a breeze with this clever piston reset tool set. Designed to push caliper pistons back into their bores quickly and evenly, these dual wedges slide in from opposite sides—just squeeze them together and watch the pistons retract smoothly, no wrestling with tire levers required. Sold as a pair.

Finger holes make removal easy, and you can even use a single wedge to reset pistons with pads still installed in a pinch. Built for precision, these tools ensure pistons reset squarely and cleanly—no more fiddling, sticking, or angled frustration.

1. Insert wedge a wedge into either side of the caliper

2. Slide wedges together until pistons are reset

3. Remove wedges using finger holes

Available in three sizes (18mm, 26mm, and 36mm) to fit everything from compact 2-piston road calipers to beefy 4-piston downhill brakes. The 26mm is the versatile all-rounder, while the 18mm excels in tighter calipers like B-pad Shimanos. The XXL 36mm is ideal for big brakes like SRAM Code and Shimano Saints.